CN1868881A - Technological process method of producing aluminium oxide using high aluminium slag - Google Patents
Technological process method of producing aluminium oxide using high aluminium slag Download PDFInfo
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- CN1868881A CN1868881A CN 200510200300 CN200510200300A CN1868881A CN 1868881 A CN1868881 A CN 1868881A CN 200510200300 CN200510200300 CN 200510200300 CN 200510200300 A CN200510200300 A CN 200510200300A CN 1868881 A CN1868881 A CN 1868881A
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Abstract
A process for preparing alumina from the high-Al slag generated by smelting iron with high-Fe bauxite includes such steps as ordinary-pressure dissolving out, red mud separating deposition, removing Si from overflow liquid, carbonating for decomposing to obtain aluminum hydroxide, and calcining.
Description
The technical field is as follows:
the invention relates to an alumina production process, in particular to a process method for producing alumina by using slag after iron making by high-iron bauxite.
Background art:
currently, the raw material for producing alumina in the world is bauxite, the types of ores are divided into gibbsite, boehmite and diaspore, and the production method mainly comprises a sintering method, a Bayer method, a combination method and the like.
The raw material of foreign alumina factories is mainly gibbsite, the alumina content in the ore is more than 35 percent, usually about 45 percent, and the aluminum-silicon ratio of the ore is more than 8.
The main raw material of Chinese alumina factories is diaspore, the content of alumina in ores is usually 60-70%, and the ratio of aluminum to silicon in the ores is more than 5.
Because the quantity of bauxite used by alumina plants is large every year, high-grade ore is reduced year by year, and the problem of bauxite resource shortage in China is increasingly serious, part of the alumina plants begin to use imported ore or consider going to foreign factories and handling ores.
Under the condition of insufficient bauxite resources in China, how to utilize low-grade bauxite resources becomes a difficult problem in the alumina industry. In the provinces of Guangxi and Guizhou, a large amount of high-iron bauxite resources exist, such as Nanning to Yulin areas of Guangxi, the reserves of the high-iron gibbsite are very abundant, and according to geological exploration reports, the reserves of the high-iron gibbsite reach billions of tons, and if the high-iron gibbsite can be developed and utilized, the high-iron gibbsite is a great wealth.
The alumina grade in Guangxi high-iron gibbsite is very low, only 23-28%, and the aluminum-siliconratio of ore is only 2-3, and according to the judgment of the prior art, the two indexes of alumina and aluminum-silicon ratio in ore can not meet the requirement of producing alumina. Meanwhile, the content of iron oxide in the ore is 35-42%, and the grade of iron making is low. If the ore resources are to be comprehensively utilized, a new process and a new technology are required to be adopted.
The comprehensive utilization of the high-iron bauxite is divided into two parts, wherein the first part is to use the high-iron bauxite for blast furnace ironmaking to obtain pig iron and high-aluminum slag; the second part is to use the high-alumina slag to refine alumina. However, no technological process method suitable for producing alumina by using high-alumina furnace slag exists in the prior art.
The invention provides a new process method for producing alumina by using ironmaking high-alumina slag, aiming at the resource condition and chemical composition of high-iron bauxite.
The invention content is as follows:
the invention aims to: the technical process method for producing the alumina by using the high-alumina furnace slag is simple in technical process, easy to operate and control and capable of using the high-alumina furnace slag after the high-iron bauxite is ironed for producing the alumina, so that the obtained alumina product can meet the requirements of national standard metallurgical grade secondary products, the defects of the prior art are overcome, and the aim of comprehensively utilizing the abundant low-grade mineral resources in China is fulfilled.
The invention is realized by the following steps: sending high-alumina furnace slag obtained after iron making from high-iron bauxite into an atmospheric pressure dissolution process for atmosphericpressure dissolution, sending slurry dissolved in the atmospheric pressure dissolution process to a red mud separation and sedimentation process, desiliconizing crude liquid overflowing through the red mud separation and sedimentation process through a desiliconization process, then sending the crude liquid into a carbonation decomposition process for carbonation treatment, and sending aluminum hydroxide obtained after carbonation treatment through the carbonation decomposition process into a roasting process for roasting treatment to obtain a qualified aluminum oxide product.
The bottom flow obtained by the red mud separation and sedimentation process is treated, the red mud obtained by the washing and filtering process is sent to a red mud storage yard or used for producing building materials, and the red mud washing liquid is sent to a circulating mother liquor storage tank; the mother liquor obtained after carbonation decomposition procedure carbon content is passed through evaporation procedure to remove excess water and transferred into circulating mother liquor storage tank, and the industrial alkali powder is added into said tank, and its addition quantity is 1 ton Al production2O3Adding 60-100 kg of industrial alkali powder for controlling, and sending the blended liquid to a normal-pressure dissolution process for use; the normal pressure dissolving-out process is carried out in a normal pressure mechanical stirring tank, the dissolving-out temperature is 100-108 ℃, the dissolving-out time including the feeding and discharging time is 4-7 hours, and the high-alumina slag is self-pulverized when cooled; separating slurry dissolved out in the red mud separation and sedimentation process by using a sedimentation tank and carrying out reverse washing for multiple times, wherein the optimal washing time is 5-6 times; the method adopts a carbonation decomposition mode to decompose the alumina in the solution, and the carbon content of the CO is required2The gas is supplied by flue gas generated by the blast furnace.
The invention relates to a technological process method of main procedures for producing alumina by using high-alumina furnace slag, and the method is characterized in that:
(1) dissolving out the high-aluminum slag at normal pressure: the main chemical component of the high-alumina slag obtained after the iron making of the high-iron bauxite is Al2O3：30～35％，CaO：45～50％，SiO2: 13-16%. Main component of calcium aluminate slagIs 12CaO.7Al2O3.，CaO.Al2O3，2CaO.SiO2The calcium aluminate slag of such composition is very easy to dissolve and leach out by the sodium carbonate solution. The chemical reaction formula is as follows:
by utilizing the characteristic that the high-aluminum slag can be self-pulverized during cooling, the high-aluminum slag can be directly dissolved out under normal pressure without crushing and grinding, and the dissolved slurry is sent to a red mud separation and sedimentation process.
The circulating mother liquor for dissolving out the high-alumina slag consists of carbon evaporation mother liquor, red mud washing liquor and industrial alkali powder.
The dissolution is carried out in a mechanical stirring tank at normal pressure, the dissolution temperature is 100-108 ℃, the dissolution time is 4-7 hours (including the feeding and discharging time), the dissolution is interrupted, the circulating mother liquor is soda carbonate, Na2OcThe concentration is 80-110 g/l, the high-aluminum furnace slag can be pulverized automatically when being cooled, and the procedures of crushing and grinding are not needed.
The process of normal pressure dissolution is very simple and has essential difference compared with the prior high pressure dissolution. The existing dissolution is high-temperature high-pressure high-alkali dissolution, the temperature is 260-280 ℃, the pressure is 4.4-5.0 Mpa, the circulating mother liquor is caustic alkali, Na2OKThe concentration is 210-248 g/l, so as to ensure Al in the ore2O3The dissolution rate has strict requirements on the bauxite granularity and needs to be provided with crushing and ore grinding toolsAnd (4) sequencing.
(2) Red mud separation and sedimentation: the dissolved slurry is separated by a settling tank and reversely washed for many times, and the red mud is filtered and then sent to a red mud storage yard or used for producing building materials. And (4) delivering the overflow of the separation settling tank to desiliconize, and performing leaf filtration by using a leaf filter, wherein the silicon content index of the refined liquid can reach more than 400. Washing the red mud for 5-6 times. Because the content of alumina in the blast-aluminum furnace slag is low and the amount of red mud is large, 3.5-4.0 tons of red mud is produced per ton of alumina, and the addition amount of red mud washing water is 2 t/t-red mud.
The content of alumina in the ore used in the existing alumina plant is high, generally 60-70%, and each ton of alumina produces only 0.9-1.3 tons of red mud, so the addition amount of red mud washing water is large, generally 3.5-4.5 t/t-red mud. The number of washing times is 3 to 4. The crude liquid of the separation and sedimentation tank is not provided with an independent desiliconization process.
(3) And carbonation decomposition: and decomposing the alumina in the solution by adopting a carbonation decomposition mode, and sending to washing. In order to ensure the dissolution of thehigh-aluminum slag, a sodium carbonate solution is needed, and the process adopts carbonation decomposition, so that a closed production cycle is conveniently formed. Carbon content required CO2The gas is supplied by the flue gas generated by the blast furnace, and the CO in the flue gas of the blast furnace2The concentration is 20-25%, and the concentration of the refined liquid Al2O3 is 80-90 g/l.
The existing alumina decomposition process is greatly different from the original decomposition process, the Bayer process adopts seed separation, the sintering process adopts carbon separation and sintering seed separation, and the carbon separation uses CO from a lime furnace2Alkali concentration and CO in gas, production concentrate2The concentration of gas is also higher.
(4) And (3) carbon content mother liquor evaporation: in order to balance water in the production system, an evaporation process is arranged, redundant water is removed, and qualified mother liquor is prepared. Evaporation of stock Na2OCThe concentration is 80-90 g/1, mother liquor Na is evaporated2OCThe concentration is 120-130 g/l.
The process adopts a conventional process.
(5) And roasting aluminum hydroxide: and (3) carrying out a roasting process on the aluminum hydroxide obtained by carbonation, and removing attached water and crystal water at high temperature to obtain an aluminum oxide lattice product.
The invention has the beneficial effects that: the method comprehensively utilizes the abundant low-grade mineral resources in China, uses the high-alumina slag obtained after the high-iron bauxite is ironed for producing the alumina, and the obtained alumina product can meet the requirements of national standard metallurgical grade secondary products, thereby having great economic benefit and social benefit. In addition, the invention also has the advantages of simple process flow and easy operation and control.
Description of the drawings:
FIG. 1 is a process flow chart of the present invention for producing alumina from high-alumina slag.
The specific implementation mode is as follows:
example of implementation of the invention: conveying the high-alumina slag from an iron-making plant to a raw material yard of an alumina plant, and then conveying the high-alumina slag to a dissolution process of the alumina plant for dissolution by using conveying equipment, wherein the dissolution adopts an atmospheric dissolution process, the atmospheric dissolution process is carried out in an atmospheric mechanical stirring tank, the dissolution temperature is controlled to be 100-108 ℃, the dissolution time including feeding and discharging time is controlled to be 4-7 hours, and the high-alumina slag can be self-pulverized when being cooled; the slurry dissolved out in the normal pressure dissolution process is sent to a conventional red mud separation and sedimentation processIn the procedure, red mud separation and sedimentation treatment is carried out, overflow crude liquid subjected to red mud separation and sedimentation treatment is sent to desiliconization and filtration to prepare qualified sodium aluminate fine liquid, in order to ensure that the desiliconization silicon content index reaches more than 400, partial crystal seeds and lime milk can be added conventionally during desiliconization, then the sodium aluminate fine liquid obtained after the desiliconization procedure is sent to a conventional carbonation decomposition procedure to be subjected to carbonationtreatment to obtain aluminum hydroxide, and the aluminum hydroxide obtained after carbonation treatment is sent to a conventional roasting procedure to be treated to obtain a qualified aluminum oxide product. During production, the underflow obtained from red mud separation and sedimentation process is treated, the red mud obtained from washing and filtering process is sent to red mud storage yard or used for producing building material, the red mud washing liquid is sent to a circulating mother liquor storage tank, the mother liquor obtained from carbonation decomposition process is sent to the circulating mother liquor storage tank after excessive moisture is removed by evaporation process, and a proper amount of industrial alkali powder is added into the tank for blending, wherein the addition amount of the industrial alkali powder is 1 ton of Al produced per ton2O3And adding 60-100 kg of industrial alkali powder for controlling, and taking the prepared liquid as a circulating mother liquid to be sent to a normal-pressure dissolution process for use, and then using the circulating mother liquid for dissolution of the blast furnace slag to form a closed circulation system. The slurry dissolved out in the red mud separation and sedimentation process is preferably separated by a sedimentation tank and reversely washed for multiple times, and the optimal washing times are controlled to be 5-6 times; when the alumina in the solution is decomposed by adopting a carbonation decomposition mode, the CO required by the carbon content of the alumina is decomposed2The gas can be supplied by using flue gas generated by a blast furnace in the prior art.
Claims (5)
1. A process method for producing alumina by using high-alumina furnace slag is characterized in that: sending high-alumina furnace slag obtained after iron making from high-iron bauxite into an atmospheric pressure dissolution process for atmospheric pressure dissolution, sending slurry dissolved in the atmospheric pressure dissolution process to a red mud separation and sedimentation process, desiliconizing crude liquid overflowing through the red mud separation and sedimentation process through a desiliconization process, then sending the crude liquid into a carbonation decomposition process for carbonation treatment, and sending aluminum hydroxide obtained after carbonation treatment through the carbonation decomposition process into a roasting process for roasting treatment to obtain a qualified aluminum oxide product.
2. The process for producing alumina from high-alumina slag according to claim 1, wherein: the bottom flow obtained by the red mud separation and sedimentation process is treated, the red mud obtained by the washing and filtering process is sent to a red mud storage yard or used for producing building materials, and the red mud washing liquid is sent to a circulating mother liquor storage tank; and (3) removing excessive water from the mother liquor obtained after the carbonation decomposition procedure through an evaporation procedure, then sending the mother liquor to a circulating mother liquor storage tank, adding industrial alkali powder into the tank for blending, wherein the addition amount of the industrial alkali powder is controlled according to the addition amount of 60-100 kg of the industrial alkali powder into 1 ton of Al2O3 produced, and sending the blended liquid to an atmospheric pressure dissolution procedure for use.
3. The process for producing alumina from high-alumina slag according to claim 1, wherein: the normal pressure dissolving process is carried out in a normal pressure mechanical stirring tank, the dissolving temperature is 100-108 ℃, the dissolving time including the feeding and dischargingtime is 4-7 hours, and the high-aluminum slag is self-pulverized when cooled.
4. The process for producing alumina from high-alumina slag according to claim 1, wherein: the slurry dissolved out in the red mud separation and sedimentation process needs to be separated by a sedimentation tank and reversely washed for multiple times, and the optimal washing time is 5-6 times.
5. The process for producing alumina from high-alumina slag according to claim 1, wherein: the alumina in the solution is decomposed by means of carbonation decomposition, and CO2 gas required by carbon content is supplied by flue gas generated by a blast furnace.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920978A (en) * | 2010-06-25 | 2010-12-22 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| CN106241843A (en) * | 2016-07-19 | 2016-12-21 | 武汉理工大学 | A kind of method that aluminium hydroxide is prepared in polyaluminium waste slag of aluminum acid system recovery |
| CN109556414A (en) * | 2017-09-27 | 2019-04-02 | 沈阳铝镁设计研究院有限公司 | A kind of residual-heat utilization method and device of Aluminium hydroxide roasting furnace product |
| CN111747432A (en) * | 2019-03-29 | 2020-10-09 | 沈阳铝镁设计研究院有限公司 | Method for improving decomposition yield of alumina plant |
| CN111874927A (en) * | 2020-06-22 | 2020-11-03 | 河南华慧有色工程设计有限公司 | Carbon method aluminum oxide energy-saving emission-reducing production method |
-
2005
- 2005-05-25 CN CN200510200300A patent/CN100593018C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920978A (en) * | 2010-06-25 | 2010-12-22 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| CN101920978B (en) * | 2010-06-25 | 2012-12-12 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| CN106241843A (en) * | 2016-07-19 | 2016-12-21 | 武汉理工大学 | A kind of method that aluminium hydroxide is prepared in polyaluminium waste slag of aluminum acid system recovery |
| CN109556414A (en) * | 2017-09-27 | 2019-04-02 | 沈阳铝镁设计研究院有限公司 | A kind of residual-heat utilization method and device of Aluminium hydroxide roasting furnace product |
| CN109556414B (en) * | 2017-09-27 | 2020-06-12 | 沈阳铝镁设计研究院有限公司 | Method and device for utilizing waste heat of aluminum hydroxide roasting furnace product |
| CN111747432A (en) * | 2019-03-29 | 2020-10-09 | 沈阳铝镁设计研究院有限公司 | Method for improving decomposition yield of alumina plant |
| CN111874927A (en) * | 2020-06-22 | 2020-11-03 | 河南华慧有色工程设计有限公司 | Carbon method aluminum oxide energy-saving emission-reducing production method |
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